Method and apparatus for transmitting or receiving signal in wireless communication system

ABSTRACT

Disclosed herein is a terminal configured to acquire a configuration for at least one PUCCH resource set associated with at least one downlink multicast channel, monitor a PDCCH in a search space for scheduling of a specific downlink multicast channel, and detect, as a result of the monitoring of the PDCCH, DCI having a CRC scrambled with a specific G-RNTI, wherein a specific PUCCH resource set associated with the specific downlink multicast channel may be mapped to a specific downlink frequency band having the search space for the monitoring of the PDCCH, wherein a PUCCH resource for transmission of HARQ-ACK for the specific downlink multicast channel among one or more PUCCH resources included in the specific PUCCH resource set may be indicated through the DCI.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.63/062,413, filed on Aug. 6, 2020, which is hereby incorporated byreference as if fully set forth herein.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system, andmore particularly, to a method and apparatus for transmitting/receivinga wireless signal.

BACKGROUND

Generally, a wireless communication system is developing to diverselycover a wide range to provide such a communication service as an audiocommunication service, a data communication service and the like. Thewireless communication is a sort of a multiple access system capable ofsupporting communications with multiple users by sharing availablesystem resources (e.g., bandwidth, transmit power, etc.). For example,the multiple access system may be any of a code division multiple access(CDMA) system, a frequency division multiple access (FDMA) system, atime division multiple access (TDMA) system, an orthogonal frequencydivision multiple access (OFDMA) system, and a single carrier frequencydivision multiple access (SC-FDMA) system.

SUMMARY

An object of the present disclosure is to provide a method ofefficiently performing wireless signal transmission/reception proceduresand an apparatus therefor.

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present disclosure are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present disclosure could achieve will be more clearlyunderstood from the following detailed description.

In one aspect of the present disclosure, a method for method forreceiving a signal by a terminal in a wireless communication system mayinclude acquiring a configuration for at least one physical uplinkcontrol channel (PUCCH) resource set associated with at least onedownlink multicast channel, monitoring a physical downlink controlchannel (PDCCH) in a search space for scheduling of a specific downlinkmulticast channel among the at least one downlink multicast channel, anddetecting, as a result of the monitoring of the PDCCH, downlink controlinformation (DCI) having a cyclic redundancy check (CRC) scrambled witha specific group-radio network temporary identifier (G-RNTI). A specificPUCCH resource set associated with the specific downlink multicastchannel may be mapped to a specific downlink frequency band having thesearch space for the monitoring of the PDCCH. A PUCCH resource fortransmission of hybrid automatic repeat request (HARQ)-acknowledgement(ACK) for the specific downlink multicast channel among one or morePUCCH resources included in the specific PUCCH resource set may beindicated through the DCI.

The PUCCH resource for the transmission of the HARQ-ACK may be indicatedthrough a PUCCH resource indicator included in the DCI.

The at least one PUCCH resource set associated with the at least onedownlink multicast channel may be configured separately from a PUCCHresource set associated with a downlink unicast channel.

The specific PUCCH resource set may be mapped to one or more G-RNTIsincluding the specific G-RNTI.

Transmitting the HARQ-ACK through the determined PUCCH resource may notbe allowed when a timer for uplink timing of the terminal expires.

The terminal may transmit the HARQ-ACK through the determined PUCCHresource on a basis that a timer for the uplink timing has not expired.

The specific downlink frequency band may be related to an activebandwidth part (BWP) of the terminal.

The specific downlink frequency band may correspond to a terminal-commonfrequency resource.

The specific downlink multicast channel may be a multicast trafficchannel carrying multicast data.

In another aspect of the present disclosure, a computer-readablerecording medium having a program recorded thereon for executing thesignal reception method described above may be provided.

In another aspect of the present disclosure, a terminal for carrying outthe above-described signal reception method may be provided.

In another aspect of the present disclosure, a device for controllingthe terminal for carrying out the above-described signal receptionmethod may be provided.

In another aspect of the present disclosure, a method for transmitting asignal by a base station in a wireless communication system may includeconfiguring at least one physical uplink control channel (PUCCH)resource set associated with at least one downlink multicast channel,generating downlink control information (DCI) having a cyclic redundancycheck (CRC) scrambled with a specific group-radio network temporaryidentifier (G-RNTI), and transmitting a physical downlink controlchannel (PDCCH) carrying the DCI in a search space for scheduling of aspecific downlink multicast channel among the at least one downlinkmulticast channel.

A specific PUCCH resource set associated with the specific downlinkmulticast channel may be mapped to a specific downlink frequency bandhaving the search space for the transmitting of the PDCCH. A PUCCHresource for reception of hybrid automatic repeat request(HARQ)-acknowledgement (ACK) for the specific downlink multicast channelamong one or more PUCCH resources included in the specific PUCCHresource set may be indicated through the DCI.

In another aspect of the present disclosure, a base station for carryingout the signal transmission method described above may be provided.

According to an embodiment of the present disclosure, a PUCCH resourceset for HARQ-ACK feedback for multicast transmission may beconfigured/indicated separately from unicast transmission. Accordingly,multicast transmission and HARQ-ACK feedback may be carried out moreefficiently and reliably.

It will be appreciated by persons skilled in the art that the effectsthat can be achieved with the present disclosure are not limited to whathas been particularly described hereinabove and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates physical channels used in a 3rd generationpartnership project (3GPP) system, which is an example of wirelesscommunication systems, and a general signal transmission method usingthe same;

FIG. 2 illustrates a radio frame structure;

FIG. 3 illustrates a resource grid of a slot;

FIG. 4 illustrates exemplary mapping of physical channels in a slot;

FIG. 5 is a diagram illustrating a signal flow for a physical downlinkcontrol channel (PDCCH) transmission and reception process;

FIGS. 6 and 7 illustrate exemplary control resource set (CORESET)structures;

FIG. 8 illustrates an MBMS-related feedback scheme according to anembodiment of the present disclosure;

FIG. 9 illustrates a signal transmission/reception method according toan embodiment of the present disclosure;

FIGS. 10 to 13 illustrate a communication system 1 and wireless devicesapplied to the present disclosure; and

FIG. 14 illustrates an exemplary discontinuous reception (DRX) operationapplied to the present disclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure are applicable to a variety ofwireless access technologies such as code division multiple access(CDMA), frequency division multiple access (FDMA), time divisionmultiple access (TDMA), orthogonal frequency division multiple access(OFDMA), and single carrier frequency division multiple access(SC-FDMA). CDMA can be implemented as a radio technology such asUniversal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can beimplemented as a radio technology such as Global System for Mobilecommunications (GSM)/General Packet Radio Service (GPRS)/Enhanced DataRates for GSM Evolution (EDGE). OFDMA can be implemented as a radiotechnology such as Institute of Electrical and Electronics Engineers(IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Worldwideinteroperability for Microwave Access (WiMAX)), IEEE 802.20, and EvolvedUTRA (E-UTRA). UTRA is a part of Universal Mobile TelecommunicationsSystem (UMTS). 3rd Generation Partnership Project (3GPP) Long TermEvolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, andLTE-Advanced (A) is an evolved version of 3GPP LTE. 3GPP NR (New Radioor New Radio Access Technology) is an evolved version of 3GPP LTE/LTE-A.

As more and more communication devices require a larger communicationcapacity, there is a need for mobile broadband communication enhancedover conventional radio access technology (RAT). In addition, massiveMachine Type Communications (MTC) capable of providing a variety ofservices anywhere and anytime by connecting multiple devices and objectsis another important issue to be considered for next generationcommunications. Communication system design considering services/UEssensitive to reliability and latency is also under discussion. As such,introduction of new radio access technology considering enhanced mobilebroadband communication (eMBB), massive MTC, and Ultra-Reliable and LowLatency Communication (URLLC) is being discussed. In the presentdisclosure, for simplicity, this technology will be referred to as NR(New Radio or New RAT).

For the sake of clarity, 3GPP NR is mainly described, but the technicalidea of the present disclosure is not limited thereto.

Details of the background, terminology, abbreviations, etc. used hereinmay be found in 3GPP standard documents published before the presentdisclosure.

Following documents are incorporated by reference:

3GPP LTE

-   -   TS 36.211: Physical channels and modulation    -   TS 36.212: Multiplexing and channel coding    -   TS 36.213: Physical layer procedures    -   TS 36.300: Overall description    -   TS 36.321: Medium Access Control (MAC)    -   TS 36.331: Radio Resource Control (RRC)

3GPP NR

-   -   TS 38.211: Physical channels and modulation    -   TS 38.212: Multiplexing and channel coding    -   TS 38.213: Physical layer procedures for control    -   TS 38.214: Physical layer procedures for data    -   TS 38.300: NR and NG-RAN Overall Description    -   TS 38.321: Medium Access Control (MAC)    -   TS 38.331: Radio Resource Control (RRC) protocol specification

Abbreviations and Terms

-   -   PDCCH: Physical Downlink Control CHannel    -   PDSCH: Physical Downlink Shared CHannel    -   PUSCH: Physical Uplink Shared CHannel    -   CSI: Channel state information    -   RRM: Radio resource management    -   RLM: Radio link monitoring    -   DCI: Downlink Control Information    -   CAP: Channel Access Procedure    -   Ucell: Unlicensed cell    -   PCell: Primary Cell    -   PSCell: Primary SCG Cell    -   TBS: Transport Block Size    -   SLIV: Starting and Length Indicator Value    -   BWP: BandWidth Part    -   CORESET: COntrol REsourse SET    -   REG: Resource element group    -   SFI: Slot Format Indicator    -   COT: Channel occupancy time    -   SPS: Semi-persistent scheduling    -   PLMN ID: Public Land Mobile Network identifier    -   RACH: Random Access Channel    -   RAR: Random Access Response    -   MBMS: Multimedia Broadcast/Multicast Service    -   Msg3: Message transmitted on UL-SCH containing a C-RNTI MAC CE        or CCCH SDU, submitted from upper layer and associated with the        UE Contention Resolution Identity, as part of a Random Access        procedure.    -   Special Cell: For Dual Connectivity operation the term Special        Cell refers to the PCell of the MCG or the PSCell of the SCG        depending on if the MAC entity is associated to the MCG or the        SCQ respectively. Otherwise the term Special Cell refers to the        PCell. A Special Cell supports PUCCH transmission and        contention-based Random Access, and is always activated.    -   Serving Cell: A PCell, a PSCell, or an SCell    -   MBSFN Synchronization Area: (in case of LTE) an area of the        network where all eNodeBs can be synchronized and perform MBSFN        transmissions. MBSFN Synchronization Areas are capable of        supporting one or more MBSFN Areas. On a given frequency layer,        eNodeB can only belong to one MBSFN Synchronization Area. MBSFN        Synchronization Areas are independent from the definition of        MBMS Service Areas.    -   MBSFN Transmission or a transmission in MBSFN mode: a        simultaneous broadcast scheme performed by transmitting the same        waveforms at the same time from multiple cells. An MBSFN        Transmission from multiple cells within the MBSFN Area is seen        as a single transmission by a UE.    -   MBSFN Area: an MBSFN Area consists of a group of cells within an        MBSFN Synchronization Area of a network, which are co-ordinated        to achieve an MBSFN Transmission. Except for the MBSFN Area        Reserved Cells, all cells within an MBSFN Area contribute to the        MBSFN Transmission and advertise its availability. The UE may        only need to consider a subset of the configured MBSFN area        (i.e., service(s) in interest).

In a wireless communication system, a user equipment (UE) receivesinformation through downlink (DL) from a base station (BS) and transmitinformation to the BS through uplink (UL). The information transmittedand received by the BS and the UE includes data and various controlinformation and includes various physical channels according totype/usage of the information transmitted and received by the UE and theBS.

FIG. 1 illustrates physical channels used in a 3GPP NR system and ageneral signal transmission method using the same.

When a UE is powered on again from a power-off state or enters a newcell, the UE performs an initial cell search procedure, such asestablishment of synchronization with a BS, in step S101. To this end,the UE receives a synchronization signal block (SSB) from the BS. TheSSB includes a primary synchronization signal (PSS), a secondarysynchronization signal (SSS), and a physical broadcast channel (PBCH).The UE establishes synchronization with the BS based on the PSS/SSS andacquires information such as a cell identity (ID). The UE may acquirebroadcast information in a cell based on the PBCH. The UE may receive aDL reference signal (RS) in an initial cell search procedure to monitora DL channel status.

After initial cell search, the UE may acquire more specific systeminformation by receiving a physical downlink control channel (PDCCH) andreceiving a physical downlink shared channel (PDSCH) based oninformation of the PDCCH in step S102.

The UE may perform a random access procedure to access the BS in stepsS103 to S106. For random access, the UE may transmit a preamble to theBS on a physical random access channel (PRACH) (S103) and receive aresponse message for preamble on a PDCCH and a PDSCH corresponding tothe PDCCH (S104). In the case of contention-based random access, the UEmay perform a contention resolution procedure by further transmittingthe PRACH (S105) and receiving a PDCCH and a PDSCH corresponding to thePDCCH (S106).

After the foregoing procedure, the UE may receive a PDCCH/PDSCH (S107)and transmit a physical uplink shared channel (PUSCH)/physical uplinkcontrol channel (PUCCH) (S108), as a general downlink/uplink signaltransmission procedure. Control information transmitted from the UE tothe BS is referred to as uplink control information (UCI). The UCIincludes hybrid automatic repeat and requestacknowledgement/negative-acknowledgement (HARQ-ACK/NACK), schedulingrequest (SR), channel state information (CSI), etc. The CSI includes achannel quality indicator (CQI), a precoding matrix indicator (PMI), arank indicator (RI), etc. While the UCI is transmitted on a PUCCH ingeneral, the UCI may be transmitted on a PUSCH when control informationand traffic data need to be simultaneously transmitted. In addition, theUCI may be aperiodically transmitted through a PUSCH according torequest/command of a network.

FIG. 2 illustrates a radio frame structure. In NR, uplink and downlinktransmissions are configured with frames. Each radio frame has a lengthof 10 ms and is divided into two 5-ms half-frames (1F). Each half-frameis divided into five 1-ms subframes (SFs). A subframe is divided intoone or more slots, and the number of slots in a subframe depends onsubcarrier spacing (SCS). Each slot includes 12 or 14 OrthogonalFrequency Division Multiplexing (OFDM) symbols according to a cyclicprefix (CP). When a normal CP is used, each slot includes 14 OFDMsymbols. When an extended CP is used, each slot includes 12 OFDMsymbols.

Table 1 exemplarily shows that the number of symbols per slot, thenumber of slots per frame, and the number of slots per subframe varyaccording to the SCS when the normal CP is used.

TABLE 1 SCS (15 * 2^(u)) N_(symb) ^(slot) N_(slot) ^(frame,u) N_(slot)^(subframe,u)  15 KHz (u = 0) 14  10  1  30 KHz (u = 1) 14  20  2  60KHz (u = 2) 14  40  4 120 KHz (u = 3) 14  80  8 240 KHz (u = 4) 14 16016 *N_(symb) ^(slot): Number of symbols in a slot *N_(slot) ^(frame,u):Number of slots in a frame *N_(slot) ^(subframe,u): Number of slots in asubframe

Table 2 illustrates that the number of symbols per slot, the number ofslots per frame, and the number of slots per subframe vary according tothe SCS when the extended CP is used.

TABLE 2 SCS (15 * 2^(u)) N_(symb) ^(slot) N_(slot) ^(frame,u) N_(slot)^(subframe,u) 60 KHz (u = 2) 12 40 4

The structure of the frame is merely an example. The number ofsubframes, the number of slots, and the number of symbols in a frame mayvary.

In the NR system, OFDM numerology (e.g., SCS) may be configureddifferently for a plurality of cells aggregated for one UE. Accordingly,the (absolute time) duration of a time resource (e.g., an SF, a slot ora TTI) (for simplicity, referred to as a time unit (TU)) consisting ofthe same number of symbols may be configured differently among theaggregated cells. Here, the symbols may include an OFDM symbol (or aCP-OFDM symbol) and an SC-FDMA symbol (or a discrete Fouriertransform-spread-OFDM (DFT-s-OFDM) symbol).

FIG. 3 illustrates a resource grid of a slot. A slot includes aplurality of symbols in the time domain. For example, when the normal CPis used, the slot includes 14 symbols. However, when the extended CP isused, the slot includes 12 symbols. A carrier includes a plurality ofsubcarriers in the frequency domain. A resource block (RB) is defined asa plurality of consecutive subcarriers (e.g., 12 consecutivesubcarriers) in the frequency domain. A bandwidth part (BWP) may bedefined to be a plurality of consecutive physical RBs (PRBs) in thefrequency domain and correspond to a single numerology (e.g., SCS, CPlength, etc.). The carrier may include up to N (e.g., 5) BWPs. Datacommunication may be performed through an activated BWP, and only oneBWP may be activated for one UE. In the resource grid, each element isreferred to as a resource element (RE), and one complex symbol may bemapped to each RE.

FIG. 4 illustrates exemplary mapping of physical channels in a slot. Inthe NR system, a frame is characterized by a self-contained structure inwhich all of a DL control channel, DL or UL data, and a UL controlchannel may be included in one slot. For example, the first N symbols(hereinafter, referred to as a DL control region) of a slot may be usedto transmit a DL control channel (e.g., PDCCH), and the last M symbols(hereinafter, referred to as a UL control region) of the slot may beused to transmit a UL control channel (e.g., PUCCH). Each of N and M isan integer equal to or larger than 0. A resource region (hereinafter,referred to as a data region) between the DL control region and the ULcontrol region may be used to transmit DL data (e.g., PDSCH) or UL data(e.g., PUSCH). A guard period (GP) provides a time gap for transmissionmode-to-reception mode switching or reception mode-to-transmission modeswitching at a BS and a UE. Some symbol at the time of DL-to-ULswitching in a subframe may be configured as a GP.

The PDCCH delivers DCI. For example, the PDCCH (i.e., DCI) may carryinformation about a transport format and resource allocation of a DLshared channel (DL-SCH), resource allocation information of an uplinkshared channel (UL-SCH), paging information on a paging channel (PCH),system information on the DL-SCH, information on resource allocation ofa higher-layer control message such as an RAR transmitted on a PDSCH, atransmit power control command, information about activation/release ofconfigured scheduling, and so on. The DCI includes a cyclic redundancycheck (CRC). The CRC is masked with various identifiers (IDs) (e.g. aradio network temporary identifier (RNTI)) according to an owner orusage of the PDCCH. For example, if the PDCCH is for a specific UE, theCRC is masked by a UE ID (e.g., cell-RNTI (C-RNTI)). If the PDCCH is fora paging message, the CRC is masked by a paging-RNTI (P-RNTI). If thePDCCH is for system information (e.g., a system information block(SIB)), the CRC is masked by a system information RNTI (SI-RNTI). Whenthe PDCCH is for an RAR, the CRC is masked by a random access-RNTI(RA-RNTI).

FIG. 5 is a diagram illustrating a signal flow for a PDCCH transmissionand reception process.

Referring to FIG. 5, a BS may transmit a control resource set (CORESET)configuration to a UE (S502). A CORSET is defined as a resource elementgroup (REG) set having a given numerology (e.g., an SCS, a CP length,and so on). An REG is defined as one OFDM symbol by one (P)RB. Aplurality of CORESETs for one UE may overlap with each other in thetime/frequency domain. A CORSET may be configured by system information(e.g., a master information block (MIB)) or higher-layer signaling(e.g., radio resource control (RRC) signaling). For example,configuration information about a specific common CORSET (e.g., CORESET#0) may be transmitted in an MIB. For example, a PDSCH carrying systeminformation block 1 (SIB1) may be scheduled by a specific PDCCH, andCORSET #0 may be used to carry the specific PDCCH. Configurationinformation about CORESET #N (e.g., N>0) may be transmitted by RRCsignaling (e.g., cell-common RRC signaling or UE-specific RRCsignaling). For example, the UE-specific RRC signaling carrying theCORSET configuration information may include various types of signalingsuch as an RRC setup message, an RRC reconfiguration message, and/or BWPconfiguration information. Specifically, a CORSET configuration mayinclude the following information/fields.

-   -   controlResourceSetId: indicates the ID of a CORESET.    -   frequencyDomainResources: indicates the frequency resources of        the CORESET. The frequency resources of the CORESET are        indicated by a bitmap in which each bit corresponds to an RBG        (e.g., six (consecutive) RBs). For example, the most significant        bit (MSB) of the bitmap corresponds to a first RBG RBGs        corresponding to bits set to 1 are allocated as the frequency        resources of the CORESET.    -   duration: indicates the time resources of the CORESET. Duration        indicates the number of consecutive OFDM symbols included in the        CORESET. Duration has a value of 1 to 3.    -   cce-REG-MappingType: indicates a control channel element        (CCE)-REG mapping type. Interleaved and non-interleaved types        are supported.    -   interleaverSize: indicates an interleaver size.    -   pdcch-DMRS-ScramblingID: indicates a value used for PDCCH DMRS        initialization.

When pdcch-DMRS-ScramblingID is not included, the physical cell ID of aserving cell is used.

-   -   precoderGranularity: indicates a precoder granularity in the        frequency domain.    -   reg-BundleSize: indicates an REG bundle size.    -   tci-PresentInDCI: indicates whether a transmission configuration        index (TCI) field is included in DL-related DCI.    -   tci-StatesPDCCH-ToAddList: indicates a subset of TCI states        configured in pdcch-Config, used for providing quasi-co-location        (QCL) relationships between DL RS(s) in an RS set (TCI-State)        and PDCCH DMRS ports.

Further, the BS may transmit a PDCCH search space (SS) configuration tothe UE (S504). The PDCCH SS configuration may be transmitted byhigher-layer signaling (e.g., RRC signaling). For example, the RRCsignaling may include, but not limited to, various types of signalingsuch as an RRC setup message, an RRC reconfiguration message, and/or BWPconfiguration information. While a CORESET configuration and a PDCCH SSconfiguration are shown in FIG. 5 as separately signaled, forconvenience of description, the present disclosure is not limitedthereto. For example, the CORESET configuration and the PDCCH SSconfiguration may be transmitted in one message (e.g., by one RRCsignaling) or separately in different messages.

The PDCCH SS configuration may include information about theconfiguration of a PDCCH SS set. The PDCCH SS set may be defined as aset of PDCCH candidates monitored (e.g., blind-detected) by the UE. Oneor more SS sets may be configured for the UE. Each SS set may be a USSset or a CSS set. For convenience, PDCCH SS set may be referred to as“SS” or “PDCCH SS”.

A PDCCH SS set includes PDCCH candidates. A PDCCH candidate is CCE(s)that the UE monitors to receive/detect a PDCCH. The monitoring includesblind decoding (BD) of PDCCH candidates. One PDCCH (candidate) includes1, 2, 4, 8, or 16 CCEs according to an aggregation level (AL). One CCEincludes 6 REGs. Each CORESET configuration is associated with one ormore SSs, and each SS is associated with one CORESET configuration. OneSS is defined based on one SS configuration, and the SS configurationmay include the following information/fields.

-   -   searchSpaceId: indicates the ID of an SS.    -   controlResourceSetId: indicates a CORESET associated with the        SS.    -   monitoringSlotPeriodicityAndOffset: indicates a periodicity (in        slots) and offset (in slots) for PDCCH monitoring.    -   monitoringSymbolsWithinSlot: indicates the first OFDM symbol(s)        for PDCCH monitoring in a slot configured with PDCCH monitoring.        The first OFDM symbol(s) for PDCCH monitoring is indicated by a        bitmap with each bit corresponding to an OFDM symbol in the        slot. The MSB of the bitmap corresponds to the first OFDM symbol        of the slot. OFDM symbol(s) corresponding to bit(s) set to 1        corresponds to the first symbol(s) of a CORESET in the slot.    -   nrofCandidates: indicates the number of PDCCH candidates (one of        values 0, 1, 2, 3, 4, 5, 6, and 8) for eachALwhereAL={1, 2, 4,        8, 16}.    -   searchSpaceType: indicates common search space (CSS) or        UE-specific search space (USS) as well as a DCI format used in        the corresponding SS type.

Subsequently, the BS may generate a PDCCH and transmit the PDCCH to theUE (S506), and the UE may monitor PDCCH candidates in one or more SSs toreceive/detect the PDCCH (S508). An occasion (e.g., time/frequencyresources) in which the UE is to monitor PDCCH candidates is defined asa PDCCH (monitoring) occasion. One or more PDCCH (monitoring) occasionsmay be configured in a slot.

Table 3 shows the characteristics of each SS.

TABLE 3 Search Type Space RNTI Use Case Type0- Common SI-RNTI on aprimary cell SIB Decoding PDCCH Type0A- Common SI-RNTI on a primary cellSIB Decoding PDCCH Type1- Common RA-RNTI or TC-RNTI on a Msg2, Msg4PDCCH primary cell decoding in RACH Type2- Common P-RNTI on a primarycell Paging Decoding PDCCH Type3- Common INT-RNTI, SFI-RNTI, PDCCHTPC-PUSCH-RNTI, TPC- PUCCH-RNTI, TPC-SRS- RNTI, C-RNTI, MCS-C- RNTI, orCS-RNTI(s) UE C-RNTI, or MCS-C-RNTI, User specific Specific orCS-RNTI(s) PDSCH decoding

Table 4 shows DCI formats transmitted on the PDCCH.

TABLE 4 DCI format Usage 0_0 Scheduling of PUSCH in one cell 0_1Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1Scheduling of PDSCH in one cell 2_0 Notifying a group of UEs of the slotformat 2_1 Notifying a group of UEs of the PRB(s) and OFDM symbol(s)where UE may assume no transmission is intended for the UE 2_2Transmission of TPC commands for PUCCH and PUSCH 2_3 Transmission of agroup of TPC commands for SRS transmissions by one or more UEs

DCI format 0_0 may be used to schedule a TB-based (or TB-level) PUSCH,and DCI format 0_1 may be used to schedule a TB-based (or TB-level)PUSCH or a code block group (CBG)-based (or CBG-level) PUSCH. DCI format1_0 may be used to schedule a TB-based (or TB-level) PDSCH, and DCIformat 1_1 may be used to schedule a TB-based (or TB-level) PDSCH or aCBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0/0_1 may bereferred to as UL grant DCI or UL scheduling information, and DCI format1_0/1_1 may be referred to as DL grant DCI or DL scheduling information.DCI format 2_0 is used to deliver dynamic slot format information (e.g.,a dynamic slot format indicator (SFI)) to a UE, and DCI format 2_1 isused to deliver DL pre-emption information to a UE. DCI format 2_0and/or DCI format 2_1 may be delivered to a corresponding group of UEson a group common PDCCH which is a PDCCH directed to a group of UEs.

DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCIformats, whereas DCI format 0_1 and DCI format 1_1 may be referred to asnon-fallback DCI formats. In the fallback DCI formats, a DCI size/fieldconfiguration is maintained to be the same irrespective of a UEconfiguration. In contrast, the DCI size/field configuration variesdepending on a UE configuration in the non-fallback DCI formats.

A CCE-to-REG mapping type is set to one of an interleaved type and anon-interleaved type.

-   -   Non-interleaved CCE-to-REG mapping (or localized CCE-to-REG        mapping) (FIG. 5): 6 REGs for a given CCE are grouped into one        REG bundle, and all of the REGs for the given CCE are        contiguous. One REG bundle corresponds to one CCE.    -   Interleaved CCE-to-REG mapping (or distributed CCE-to-REG        mapping) (FIG. 6): 2, 3 or 6 REGs for a given CCE are grouped        into one REG bundle, and the REG bundle is interleaved within a        CORESET. In a CORESET including one or two OFDM symbols, an REG        bundle includes 2 or 6 REGs, and in a CORESET including three        OFDM symbols, an REG bundle includes 3 or 6 REGs. An REG bundle        size is configured on a CORESET basis.

Multimedia Broadcast/Multicast Service (MBMS)

Next, the MBMS scheme of 3GPP LTE will be described. 3GPP MBMS may bedivided into an SFN scheme, in which multiple BS cells are synchronizedto transmit the same data on a PMCH channel, and a single cell point tomultipoint (SC-PTM) scheme, in which multiple BS cells are synchronizedto broadcast within a corresponding cell coverage on a PDCCH/PDSCH. TheSFN scheme is used to provide a broadcast service in a wide area (e.g.MBMS area) through resources pre-allocated semi-statically, while theSC-PTM scheme is mainly used to provide a broadcast service only withina cell coverage through dynamic resources.

The SC-PTM provides one logical channel SC-MCCH (Single Cell MulticastControl Channel) and one or more logical channels SC-MTCHs (Single CellMulticast Traffic Channels). These logical channels are mapped to atransmission channel DL-SCH and a physical channel PDSCH. The PDSCHcarrying SC-MCCH or SC-MTCH data is scheduled on a PDCCH indicated byG-RNTI. In this case, a TMGI corresponding to a service ID may be mappedto a specific G-RNTI value in a one-to-one correspondence manner.Accordingly, when the BS provides a plurality of services, a pluralityof G-RNTI values may be allocated for SC-PTM transmission. One or moreUEs may perform PDCCH monitoring using a specific G-RNTI to receive aspecific service. Here, an SC-PTM dedicated DRX on-duration period maybe configured for the specific service/specific G-RNTI. In this case,the UEs wake up only in a specific on-duration period to perform PDCCHmonitoring for the G-RNTI.

Uplink Feedback Based on RACH or PUCCH for Broadcast and Multicast

The above-described configurations (3GPP system, frame structure, NRsystem, etc.) may be applied in combination with the methods describedbelow according to the present disclosure, or may be supplemented toclarify the technical features of the methods proposed in the presentdisclosure. As used herein, “/” may mean “and,” “or,” or “and/or”depending on the context.

REL-17 NR intends to introduce a DL broadcast or DL multicasttransmission scheme to support the MBMS service. A point-to-multipoint(PTM) transmission scheme such as MBMS enables transmission to multipleUEs with one DL broadcast/multicast to save radio resources for each UEcompared to individual DL unicast transmission (e.g., point-to-pointtransmission).

In NR, a method by which the UE reports MBMS-related feedback (e.g.,feedback of HARQ-ACK related to retransmission of MBMS data) to the BSis under discussion for reliable DL broadcast/multicast transmission. Inthis regard, a method allowing all idle/inactive/connected UEs totransmit MBMS-related feedback is required. For a UE in the RRCconnected mode, a PUCCH resource may be configured for feedback.However, in the case of MBMS, it is difficult to always support PUCCHtransmission due to UL timing or cell change, since idle/inactive UEscan also receive the feedback.

Accordingly, in the present disclosure, an uplink feedback scheme fortransmission of an MBMS-related UL signal, for example, a DLbroadcast/multicast transmission for reporting DL MBMS-related feedbackof a UE.

Hereinafter, DL/UL BWP(s) is assumed as an example of a frequency bandrelated to the MBMS service. However, the present disclosure is notlimited to the term “BWP” and the expression of DL/UL BWP(s) may beinterpreted as intended to cover various frequency sizes/resourcescorresponding to parts of the entire DL/UL frequency band. For example,a UE-common (BWP frequency) resource on which the MBMS service isprovided may be referred to simply as a common frequency resource (CFR).

According to an embodiment of the present disclosure, a UE may operateas follows.

-   -   A UE may configure a DL BWP and a UL BWP, wherein the UE may        receive a MBMS service on the DL BWP and transmit MBMS feedback        on the UL BWP.        -   a. The UL BWP may be one of an initial UL BWP, a default UL            BWP, a configured UL BWP, an active UL BWP and an MBMS            specific UL BWP.

The UE may receive configuration of one or more PUCCH resource sets

A PUCCH resource set can be mapped to/associated with the MBMS serviceor the DL/UL BWP. Or, a PUCCH resource set can be mapped to/associatedwith one of one or more G-RNTIs, one or more TMGIs including the TMGI ofthe MBMS service, one or more MCCH channels, and one or more MTCHchannels.

The UE may monitor PDCCH on an SS set on the DL BWP.

The UE may receive a DCI with G-RNTI on PDCCH and then PDSCHtransmission carrying MCCH/MTCH TB on the DL BWP for the MBMS service,wherein the DCI on the PDCCH may indicate a PUCCH resource indicator.

While a time advance timer is running (e.g., UL (Sync.) timing ismaintained), the UE can transmit a PUCCH as indicated by the PUCCHresource indicator, to send MBMS feedback to the network.

If the TAT is not running or expires (i.e. UL timing is not maintained)or there is no valid PUCCH resource mapped to one of the TMGI of theMBMS service, the G-RNTI, MCCH, MTCH and the DL/UL BWP, the UE maytrigger RACH to send MBMS feedback to the network.

a. The MBMS feedback information may be indicated by one of a RACHpreamble, a MSGA and MSG3

b. The MBMS feedback may include one or more of HARQ ACK/NACK to thePDSCH transmission and CQI report for PDSCH transmissions of at leastthe MBMS service.

Transmitting Side (e.g., BS):

If a cell is broadcasting an MBMS service, the BS may transmit SIB1,MBMS system information block (SIB), one or more MCCHs, and/or one ormore MTCHs. Here, the MCCH and the MTCH, which are logical channels, maybe transmitted on a physical channel, PDSCH, and may be scheduled on thePDCCH. The MCCH may carry MBMS control information, and one MTCH maycarry specific MBMS service data.

The BS may provide a BWP (e.g., MBMS BWP) for MBMS to UEs. The MBMS BWPmay include at least one of an MBMS SIB DL BWP and MBMS SIB UL BWP forMBMS SIB transmission and reception, an MCCH DL BWP and MCCH UL BWP forMCCH transmission and reception, and an MTCH DL BWP and/or MTCH UL BWPfor MTCH transmission and reception. That is, one cell may provide zeroor one or more MBMS DL BWPs and zero or one or more MBMS UL BWPs.Accordingly, a BS supporting MBMS may provide all the above MBMS BWPtypes separately from the conventional initial BWP or UE-dedicated BWP,or may provide only zero or some MBMS BWP(s). Some or all MBMS BWPs maybe the same as or different from the conventional initial BWP, a defaultBWP, a first active BWP, or an active BWP.

The UE may configure SC-RNTI and MCCH transmission according to MBMS SIBor MBMS control information provided by the BS. Here, the MBMS SIB orMBMS control information may include information for configuring a DLBWP and UL BWP for the MBMS.

The MBMS SIB or MBMS control information may include at least part ofthe following information.

PUCCH Resource Set(s) for MBMS-Related Feedback

-   -   a. A common PUCCH resource mapped to a specific service ID        (e.g., TMGI), a specific G-RNTI, a specific MBMS DL BWP,        specific MTCH channel(s), or specific MCCH channel(s), or a        UE-dedicated PUCCH resource (set) used by an individual UE        receiving a specific service or a specific G-RNTI transmission        may be configured/provided.

RACH Resource for MBMS-Related Feedback

-   -   a. RACH resource information mapped to a specific service ID        (TMGI), a specific G-RNTI, a specific MBMS DL BWP, specific MTCH        channel(s), or specific MCCH channel(s) may be provided. For        example, a specific RACH preamble, a preamble occasion, or a        RACH occasion may be mapped to/associated with at least one of        the specific service ID (e.g., TMGI), specific G-RNTI, specific        MBMS DL BWP, specific MTCH channel(s), or specific MCCH        channel(s).

In FIG. 8, the BS may provide MBMS transmission on a UL BWP and DL BWP.For example, MCCH control information and MTCH transmission may beprovided on the DL BWP. Also, feedback related to PDSCH transmission forthe MCCH or feedback related to PDSCH transmission for the MTCH may beprovided on the UL BWP. For example, the UL BWP may be used forreporting of HARQ ACK/NACK or an MBMS-related SSB/CSI-RS measurementresult as an MBMS-related feedback.

The BS may configure one or more PUCCH resource sets for MBMS-relatedfeedback. Also, the BS may provide specific RACH preambles and specificRACH resources for the MBMS-related feedback.

Receiving Side (e.g., UE):

Hereinafter, the UE operation will be described. FIG. 8 illustrates anMBMS-related feedback according to the present disclosure.

The UE may configure at least one DL BWP and one UL BWP for MBMSreception. The UE may receive MBMS control information or MTCH TB on theDL BWP. The UE may transmit MBMS-related feedback for the controlinformation or MTCH TB on the UL BWP connected to/associated with the DLBWP.

The BS may configure one or more PUCCH resource sets on the UL BWP forthe UE. This configuration may be delivered to theidle/inactive/connected UE through system information, MBMS controlinformation, and/or a UE-dedicated message. As shown in FIG. 8, when theBS switches the connected UE receiving the MBMS to the idle/inactivemode, the RRC Release message transmitted by the BS to the UE mayinclude PUCCH resource set configuration information. The RRC Releasemessage may also include RACH configuration information for MBMS-relatedfeedback, which will be described later.

In one example of the present disclosure, one PUCCH resource set may bemapped to/associated with at least part of one or more G-RNTIs, one ormore DL BWPs, one or more UL BWPs, one or more MCCHs, one or more MTCHs,or one or more MBMS service IDs (e.g., TMGIs). In this case, the PUCCHresource may be shared by/common to all UEs receiving the MBMStransmission. In this case, all idle/inactive/connected UEs may send areport through the PUCCH resource. A connected UE may be allocated aUE-specific PUCCH resource separately. In this case, the UE may reportan MBMS-related feedback through a UE-dedicated PUCCH resource.

When a UL PUCCH resource is configured and a PDCCH/PDSCH for the mappedMCCH TB or MTCH TB is received, the UE may activate the corresponding ULBWP to transmit MBMS-related feedback through a PUCCH resource connectedto the TB. Alternatively, if a PDCCH for the MCCH TB or MTCH TB includesa PUCCH resource indicator, the UE may activate the UL BWP to transmitMBMS-related feedback through a PUCCH resource according to the PUCCHresource indicator.

The PUCCH resource for the MCCH TB or MTCH TB may be valid according toa mapping indication from the BS:

-   -   The resource is mapped to the MCCH or MTCH;    -   G-RNTI for TB transmission is mapped to the resource;    -   The MBMS service ID (TMGI) for the TB is mapped to the resource;    -   The DL BWP in which the TB is transmitted is mapped to the        resource; and    -   The UL BWP in which MBMS-related feedback for the TB is        transmitted is mapped to the resource.

In FIG. 8, the UE may receive DCI and MTCH TB. The CRC of the DCI may bescrambled with a G-RNTI mapped to a received service. Specifically, theBS may map/associate one or more MBMS service IDs to/with a specificMBMS search space set (hereinafter referred to as MSS set). In oneexample of the present disclosure, the MSS may be defined as a new typeof CSS, a USS, or a new search space other than the CSS/USS.

The UE may activate the DL BWP in which the MBMS service to be receivedis transmitted, and monitor the PDCCH through a specific MSS set mappedto the MBMS service. The UE may monitor the PDCCH through the MSS andreceive DCI with which the CRC is scrambled using the G-RNTI mapped tothe service. The UE may receive MBMS service data (e.g., the MTCH TB ofMCCH TB in FIG. 8) by receiving the PDSCH transmission indicated by theDCI.

Here, the PDSCH carrying the MTCH TB (or MCCH TB) may be a bundledtransmission including two or more PDSCH transmissions. The UE maytransmit HARQ feedback after transmission is performed as many times asthe number of transmissions in one bundle. The HARQ feedback may betransmitted through uplink control information (UCI) or a MAC controlelement (MAC CE).

The UE may transmit HARQ-ACK through the UCI when the PUCCH is valid. Inthe case of PUCCH transmission, the UCI may be transmitted on a PUCCHresource mapped to the corresponding TB transmission. In this case, theUCI may report ACK or NACK.

If there is no valid PUCCH resource for the MCCH TB or MTCH TB, there isno UE-dedicated PUCCH resource, or the time adjustment timer (TAT)driven by the UE to maintain the UL timing is not running or hasexpired, the UE may trigger the RACH to transmit the MAC CE.

In FIG. 8, the UE may request retransmission of the MTCH TB by reportingNACK as HARQ-ACK information. In this case, it may be difficult toreport MBMS-related feedback due to expiration of the TAT or release ofthe valid resource. Accordingly, in this case, if the MTCH TBretransmission is received and the HARQ feedback is reported, the UE maytrigger the RACH to transmit the MBMS-related feedback MAC CE. Here, theMBMS-related feedback MAC CE may include a service ID field indicatingthe TMGI or G-RNTI of the TB and an ACK/NACK indicator field. TheMBMS-related feedback MAC CE may be identified through a specific LCIDof the UL MAC PDU header.

When the MBMS-related feedback is transmitted on the RACH, a specificRACH preamble ID may be mapped as follows:

-   -   The RACH preamble ID may be mapped to the corresponding MCCH or        MTCH channel;    -   A G-RNTI for TB transmission may be mapped to the RACH preamble        ID;    -   MBMS service ID (TMGI) for TB may be mapped to the RACH preamble        ID;    -   A DL BWP through which a TB is transmitted may be mapped to the        RACH preamble ID; or    -   A UL BWP through which MBMS-related feedback for the TB is        transmitted may be mapped to the RACH preamble ID.

When the mapped RACH preamble ID is present, the UE may performcontention-free RACH transmission according to the mapped RACH preambleID. Accordingly, after the RACH preamble is transmitted and a randomaccess response (RAR) or a PDCCH is received, the RACH procedure may beterminated.

When the mapped RACH preamble ID is not present in a 4-Step RACH, the UEmay randomly select a RACH preamble ID and perform contention-based RACHtransmission. Accordingly, when the RAR is received after transmittingthe RACH preamble, MSG3 may be transmitted and the RACH procedure may beterminated.

When the mapped RACH preamble ID is not present in a 2-step RACH, the UEmay randomly select a RACH preamble ID and transmit the selected RACHpreamble ID and MSGA. After the transmission, an MSGB may be receivedand the RACH procedure may be terminated.

For the RACH transmission, the UE may determine a RACH preamble occasion(PO) and/or a RACH occasion (RO) for MSG3/MSGA PUSCH transmission basedon at least part of the following mapping:

-   -   Mapping the corresponding MCCH or MTCH to a specific PO/RO;    -   Mapping a G-RNTI for TB transmission is mapped to a specific        PO/RO;    -   Mapping an MBMS service ID (TMGI) for a TB to a specific PO/RO;    -   Mapping a DL BWP through which the TB is transmitted to a        specific PO/RO; and    -   Mapping a UL BWP through which MBMS-related feedback for the TB        is transmitted to a specific PO/RO.

The UE may change the beam/TRP/TCI state for MBMS reception through theRACH procedure. In this case, the UE may monitor the PDCCH occasionusing the CORSET/MSS set mapped to the changed beam/TRP/TCI state. TheUE may receive DCI having CRC scrambled with G-RNTI on the PDCCH.

When the MTCH TB is successfully received or when the MTCH TBcorresponds to the last transmission, the UE may transmit a HARQ ACK forthe last MTCH TB or skip HARQ ACK transmission. In the case where the UEskips the transmission, the UE may not trigger the RACH.

FIG. 9 illustrates a signal transmission/reception method according toan embodiment of the present disclosure.

Referring to FIG. 9, a BS may configure at least one physical uplinkcontrol channel (PUCCH) resource set associated with at least onedownlink multicast channel (operation 905).

A UE may acquire a configuration for the at least one PUCCH resource setassociated with the at least one downlink multicast channel (operation910).

The BS may generate downlink control information (DCI) having a cyclicredundancy check (CRC) scrambled with a specific group-radio networktemporary identifier (G-RNTI) (operation 915).

The BS may transmit a physical downlink control channel (PDCCH) carryingthe DCI in a search space for scheduling of a specific downlinkmulticast channel among the at least one downlink multicast channel(operation 920).

The UE may monitor the PDCCH in the search space for scheduling of thespecific downlink multicast channel among the at least one downlinkmulticast channel (operation 925). As a result of monitoring of thePDCCH, the UE may detect the DCI having the CRC scrambled with thespecific G-RNTI.

The UE may attempt to receive the specific downlink multicast channelbased on the DCI (operation 930).

The UE may transmit a hybrid automatic repeat request(HARQ)-acknowledgement (ACK) for the specific downlink multicast channel(operation 935).

A specific PUCCH resource set associated with the specific downlinkmulticast channel may be mapped to a specific downlink frequency band inwhich a search space in which PDCCH monitoring is performed ispositioned. Among one or more PUCCH resources included in the specificPUCCH resource set, a PUCCH resource for transmission of the HARQ-ACKfor the specific downlink multicast channel may be indicated through theDCI.

The PUCCH resource for transmission of the HARQ-ACK may be indicatedthrough a PUCCH resource indicator included in the DCI.

The at least one PUCCH resource set associated with the at least onedownlink multicast channel may be configured separately from a PUCCHresource set associated with a downlink unicast channel.

The specific PUCCH resource set may be mapped to one or more G-RNTIsincluding a specific G-RNTI.

When a timer for uplink timing of the UE expires, transmitting theHARQ-ACK through a determined PUCCH resource may not be allowed.

The UE may transmit the HARQ-ACK through the determined PUCCH resourceon a basis that the timer for the uplink timing has not expired.

The specific downlink frequency band may be related to an active BWP ofthe UE.

The specific downlink frequency band may correspond to a UE-commonfrequency resource.

The specific downlink multicast channel may be a multicast trafficchannel carrying multicast data.

The various descriptions, functions, procedures, proposals, methods,and/or operation flowcharts of the present disclosure described hereinmay be applied to, but not limited to, various fields requiring wirelesscommunication/connectivity (e.g., 5G) between devices.

More specific examples will be described below with reference to thedrawings. In the following drawings/description, like reference numeralsdenote the same or corresponding hardware blocks, software blocks, orfunction blocks, unless otherwise specified.

FIG. 10 illustrates a communication system 1 applied to the presentdisclosure.

Referring to FIG. 10, a communication system 1 applied to the presentdisclosure includes wireless devices, Base Stations (BSs), and anetwork. Herein, the wireless devices represent devices performingcommunication using Radio Access Technology (RAT) (e.g., 5G New RAT(NR)) or Long-Term Evolution (LTE)) and may be referred to ascommunication/radio/5G devices. The wireless devices may include,without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2,an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a homeappliance 100 e, an Internet of Things (IoT) device 100 f, and anArtificial Intelligence (AI) device/server 400. For example, thevehicles may include a vehicle having a wireless communication function,an autonomous driving vehicle, and a vehicle capable of performingcommunication between vehicles. Herein, the vehicles may include anUnmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may includean Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) deviceand may be implemented in the form of a Head-Mounted Device (HMD), aHead-Up Display (HUD) mounted in a vehicle, a television, a smartphone,a computer, a wearable device, a home appliance device, a digitalsignage, a vehicle, a robot, etc. The hand-held device may include asmartphone, a smartpad, a wearable device (e.g., a smartwatch or asmartglasses), and a computer (e.g., a notebook). The home appliance mayinclude a TV, a refrigerator, and a washing machine. The IoT device mayinclude a sensor and a smartmeter. For example, the BSs and the networkmay be implemented as wireless devices and a specific wireless device200 a may operate as a BS/network node with respect to other wirelessdevices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 11 illustrates wireless devices applicable to the presentdisclosure.

Referring to FIG. 11, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 10.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection. The one or more transceivers 106 and206 may transmit user data, control information, and/or radiosignals/channels, mentioned in the methods and/or operational flowchartsof this document, to one or more other devices. The one or moretransceivers 106 and 206 may receive user data, control information,and/or radio signals/channels, mentioned in the descriptions, functions,procedures, proposals, methods, and/or operational flowcharts disclosedin this document, from one or more other devices. For example, the oneor more transceivers 106 and 206 may be connected to the one or moreprocessors 102 and 202 and transmit and receive radio signals. Forexample, the one or more processors 102 and 202 may perform control sothat the one or more transceivers 106 and 206 may transmit user data,control information, or radio signals to one or more other devices. Theone or more processors 102 and 202 may perform control so that the oneor more transceivers 106 and 206 may receive user data, controlinformation, or radio signals from one or more other devices. The one ormore transceivers 106 and 206 may be connected to the one or moreantennas 108 and 208 and the one or more transceivers 106 and 206 may beconfigured to transmit and receive user data, control information,and/or radio signals/channels, mentioned in the descriptions, functions,procedures, proposals, methods, and/or operational flowcharts disclosedin this document, through the one or more antennas 108 and 208. In thisdocument, the one or more antennas may be a plurality of physicalantennas or a plurality of logical antennas (e.g., antenna ports). Theone or more transceivers 106 and 206 may convert received radiosignals/channels etc. from RF band signals into baseband signals inorder to process received user data, control information, radiosignals/channels, etc. using the one or more processors 102 and 202. Theone or more transceivers 106 and 206 may convert the user data, controlinformation, radio signals/channels, etc. processed using the one ormore processors 102 and 202 from the base band signals into the RF bandsignals. To this end, the one or more transceivers 106 and 206 mayinclude (analog) oscillators and/or filters.

FIG. 12 illustrates another example of a wireless device applied to thepresent disclosure. The wireless device may be implemented in variousforms according to a use-case/service (refer to FIG. 12).

Referring to FIG. 12, wireless devices 100 and 200 may correspond to thewireless devices 100 and 200 of FIG. 11 and may be configured by variouselements, components, units/portions, and/or modules. For example, eachof the wireless devices 100 and 200 may include a communication unit110, a control unit 120, a memory unit 130, and additional components140. The communication unit may include a communication circuit 112 andtransceiver(s) 114. For example, the communication circuit 112 mayinclude the one or more processors 102 and 202 and/or the one or morememories 104 and 204 of FIG. 11. For example, the transceiver(s) 114 mayinclude the one or more transceivers 106 and 206 and/or the one or moreantennas 108 and 208 of FIG. 11. The control unit 120 is electricallyconnected to the communication unit 110, the memory 130, and theadditional components 140 and controls overall operation of the wirelessdevices. For example, the control unit 120 may control anelectric/mechanical operation of the wireless device based onprograms/code/commands/information stored in the memory unit 130. Thecontrol unit 120 may transmit the information stored in the memory unit130 to the exterior (e.g., other communication devices) via thecommunication unit 110 through a wireless/wired interface or store, inthe memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 10), the vehicles (100 b-1 and 100 b-2 of FIG. 10), the XRdevice (100 c of FIG. 10), the hand-held device (100 d of FIG. 10), thehome appliance (100 e of FIG. 10), the IoT device (100 f of FIG. 10), adigital broadcast terminal, a hologram device, a public safety device,an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 10), the BSs (200 of FIG. 10), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 12, the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

FIG. 13 illustrates a vehicle or an autonomous driving vehicle appliedto the present disclosure. The vehicle or autonomous driving vehicle maybe implemented by a mobile robot, a car, a train, a manned/unmannedAerial Vehicle (AV), a ship, etc.

Referring to FIG. 13, a vehicle or autonomous driving vehicle 100 mayinclude an antenna unit 108, a communication unit 110, a control unit120, a driving unit 140 a, a power supply unit 140 b, a sensor unit 140c, and an autonomous driving unit 140 d. The antenna unit 108 may beconfigured as a part of the communication unit 110. The blocks110/130/140 a to 140 d correspond to the blocks 110/130/140 of FIG. 12,respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous driving vehicle 100. The control unit 120 mayinclude an Electronic Control Unit (ECU). The driving unit 140 a maycause the vehicle or the autonomous driving vehicle 100 to drive on aroad. The driving unit 140 a may include an engine, a motor, apowertrain, a wheel, a brake, a steering device, etc. The power supplyunit 140 b may supply power to the vehicle or the autonomous drivingvehicle 100 and include a wired/wireless charging circuit, a battery,etc. The sensor unit 140 c may acquire a vehicle state, ambientenvironment information, user information, etc. The sensor unit 140 cmay include an Inertial Measurement Unit (IMU) sensor, a collisionsensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor,a heading sensor, a position module, a vehicle forward/backward sensor,a battery sensor, a fuel sensor, a tire sensor, a steering sensor, atemperature sensor, a humidity sensor, an ultrasonic sensor, anillumination sensor, a pedal position sensor, etc. The autonomousdriving unit 140 d may implement technology for maintaining a lane onwhich a vehicle is driving, technology for automatically adjustingspeed, such as adaptive cruise control, technology for autonomouslydriving along a determined path, technology for driving by automaticallysetting a path if a destination is set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous driving vehicle 100may move along the autonomous driving path according to the driving plan(e.g., speed/direction control). In the middle of autonomous driving,the communication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous driving vehicles and provide the predicted trafficinformation data to the vehicles or the autonomous driving vehicles.

FIG. 14 is a diagram illustrating a DRX operation of a UE according toan embodiment of the present disclosure.

The UE may perform a DRX operation in the afore-described/proposedprocedures and/or methods. A UE configured with DRX may reduce powerconsumption by receiving a DL signal discontinuously. DRX may beperformed in an RRC_IDLE state, an RRC_INACTIVE state, and anRRC_CONNECTED state. The UE performs DRX to receive a paging signaldiscontinuously in the RRC_IDLE state and the RRC_INACTIVE state. DRX inthe RRC_CONNECTED state (RRC_CONNECTED_DRX) will be described below.

Referring to FIG. 14, a DRX cycle includes an On Duration and anOpportunity for DRX. The DRX cycle defines a time interval betweenperiodic repetitions of the On Duration. The On Duration is a timeperiod during which the UE monitors a PDCCH. When the UE is configuredwith DRX, the UE performs PDCCH monitoring during the On Duration. Whenthe UE successfully detects a PDCCH during the PDCCH monitoring, the UEstarts an inactivity timer and is kept awake. On the contrary, when theUE fails in detecting any PDCCH during the PDCCH monitoring, the UEtransitions to a sleep state after the On Duration. Accordingly, whenDRX is configured, PDCCH monitoring/reception may be performeddiscontinuously in the time domain in the afore-described/proposedprocedures and/or methods. For example, when DRX is configured, PDCCHreception occasions (e.g., slots with PDCCH SSs) may be configureddiscontinuously according to a DRX configuration in the presentdisclosure. On the contrary, when DRX is not configured, PDCCHmonitoring/reception may be performed continuously in the time domain.For example, when DRX is not configured, PDCCH reception occasions(e.g., slots with PDCCH SSs) may be configured continuously in thepresent disclosure. Irrespective of whether DRX is configured, PDCCHmonitoring may be restricted during a time period configured as ameasurement gap.

Table 5 describes a DRX operation of a UE (in the RRC_CONNECTED state).Referring to Table 5, DRX configuration information is received byhigher-layer signaling (e.g., RRC signaling), and DRX ON/OFF iscontrolled by a DRX command from the MAC layer. Once DRX is configured,the UE may perform PDCCH monitoring discontinuously in performing theafore-described/proposed procedures and/or methods, as illustrated inFIG. 5.

TABLE 5 Type of signals UE procedure l^(st) RRC signalling(MAC- ReceiveDRX configuration information Step CellGroupConfig) 2^(nd) MAC CE((Long)DRX Receive DRX command Step command MAC CE) 3^(rd) — Monitor a PDCCHduring an on-duration Step of a DRX cycle

MAC-CellGroupConfig includes configuration information required toconfigure MAC parameters for a cell group. MAC-CellGroupConfig may alsoinclude DRX configuration information. For example, MAC-CellGroupConfigmay include the following information in defining DRX.

-   -   Value of drx-OnDurationTimer: defines the duration of the        starting period of the DRX cycle.    -   Value of drx-InactivityTimer: defines the duration of a time        period during which the UE is awake after a PDCCH occasion in        which a PDCCH indicating initial UL or DL data has been detected    -   Value of drx-HARQ-RTT-TimerDL: defines the duration of a maximum        time period until a DL retransmission is received after        reception of a DL initial transmission.    -   Value of drx-HARQ-RTT-TimerDL: defines the duration of a maximum        time period until a grant for a UL retransmission is received        after reception of a grant for a UL initial transmission.    -   drx-LongCycleStartOffset: defines the duration and starting time        of a DRX cycle.    -   drx-ShortCycle (optional): defines the duration of a short DRX        cycle.

When any of drx-OnDurationTimer, drx-InactivityTimer,drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is running, the UEperforms PDCCH monitoring in each PDCCH occasion, staying in the awakestate.

The embodiments of the present disclosure described above arecombinations of elements and features of the present disclosure. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent disclosure may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent disclosure may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It is obvious tothose skilled in the art that claims that are not explicitly cited ineach other in the appended claims may be presented in combination as anembodiment of the present disclosure or included as a new claim by asubsequent amendment after the application is filed.

Those skilled in the art will appreciate that the present disclosure maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent disclosure. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of thedisclosure should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

The present disclosure is applicable to UEs, BSs, or other apparatusesin a wireless mobile communication system.

What is claimed is:
 1. A method for receiving a signal by a terminal ina wireless communication system, the method comprising: acquiring aconfiguration for at least one physical uplink control channel (PUCCH)resource set associated with at least one downlink multicast channel;monitoring a physical downlink control channel (PDCCH) in a search spacefor scheduling of a specific downlink multicast channel among the atleast one downlink multicast channel; and detecting, as a result of themonitoring of the PDCCH, downlink control information (DCI) having acyclic redundancy check (CRC) scrambled with a specific group-radionetwork temporary identifier (G-RNTI), wherein a specific PUCCH resourceset associated with the specific downlink multicast channel is mapped toa specific downlink frequency band having the search space for themonitoring of the PDCCH, wherein a PUCCH resource for transmission ofhybrid automatic repeat request (HARQ)-acknowledgement (ACK) for thespecific downlink multicast channel among one or more PUCCH resourcesincluded in the specific PUCCH resource set is indicated through theDCI.
 2. The method of claim 1, wherein the PUCCH resource for thetransmission of the HARQ-ACK is indicated through a PUCCH resourceindicator included in the DCI.
 3. The method of claim 1, wherein the atleast one PUCCH resource set associated with the at least one downlinkmulticast channel is configured separately from a PUCCH resource setassociated with a downlink unicast channel.
 4. The method of claim 1,wherein the specific PUCCH resource set is mapped to one or more G-RNTIsincluding the specific G-RNTI.
 5. The method of claim 1, whereintransmitting the HARQ-ACK through the determined PUCCH resource is notallowed when a timer for uplink timing of the terminal expires.
 6. Themethod of claim 1, further comprising: transmitting the HARQ-ACK throughthe determined PUCCH resource on a basis that a timer for the uplinktiming of the terminal has not expired.
 7. The method of claim 1,wherein the specific downlink frequency band is related to an activebandwidth part (BWP) of the terminal.
 8. The method of claim 1, whereinthe specific downlink frequency band corresponds to a terminal-commonfrequency resource.
 9. The method of claim 1, wherein the specificdownlink multicast channel is a multicast traffic channel carryingmulticast data.
 10. A computer-readable recording medium having aprogram recorded thereon for executing the method of claim
 1. 11. Aterminal for receiving a signal in a wireless communication system,comprising: a transceiver; and a processor configured to control thetransceiver to perform operations, the operations comprising: acquiringa configuration for at least one physical uplink control channel (PUCCH)resource set associated with at least one downlink multicast channel;monitoring a physical downlink control channel (PDCCH) in a search spacefor scheduling of a specific downlink multicast channel among the atleast one downlink multicast channel; and detecting, as a result of themonitoring of the PDCCH, downlink control information (DCI) having acyclic redundancy check (CRC) scrambled with a specific group-radionetwork temporary identifier (G-RNTI), wherein a specific PUCCH resourceset associated with the specific downlink multicast channel is mapped toa specific downlink frequency band having the search space for themonitoring of the PDCCH, wherein a PUCCH resource for transmission ofhybrid automatic repeat request (HARQ)-acknowledgement (ACK) for thespecific downlink multicast channel among one or more PUCCH resourcesincluded in the specific PUCCH resource set is indicated through theDCI.
 12. A device for controlling a terminal in a wireless communicationsystem, comprising: a memory configured to store instructions; and aprocessor configured to execute the instructions to perform operations,wherein the operations of the processor comprises: acquiring aconfiguration for at least one physical uplink control channel (PUCCH)resource set associated with at least one downlink multicast channel;monitoring a physical downlink control channel (PDCCH) in a search spacefor scheduling of a specific downlink multicast channel among the atleast one downlink multicast channel; and detecting, as a result of themonitoring of the PDCCH, downlink control information (DCI) having acyclic redundancy check (CRC) scrambled with a specific group-radionetwork temporary identifier (G-RNTI), wherein a specific PUCCH resourceset associated with the specific downlink multicast channel is mapped toa specific downlink frequency band having the search space for themonitoring of the PDCCH, wherein a PUCCH resource for transmission ofhybrid automatic repeat request (HARQ)-acknowledgement (ACK) for thespecific downlink multicast channel among one or more PUCCH resourcesincluded in the specific PUCCH resource set is indicated through theDCI.
 13. A method for transmitting a signal by a base station in awireless communication system, the method comprising: configuring atleast one physical uplink control channel (PUCCH) resource setassociated with at least one downlink multicast channel; generatingdownlink control information (DCI) having a cyclic redundancy check(CRC) scrambled with a specific group-radio network temporary identifier(G-RNTI); and transmitting a physical downlink control channel (PDCCH)carrying the DCI in a search space for scheduling of a specific downlinkmulticast channel among the at least one downlink multicast channel,wherein a specific PUCCH resource set associated with the specificdownlink multicast channel is mapped to a specific downlink frequencyband having the search space for the transmitting of the PDCCH, whereina PUCCH resource for reception of hybrid automatic repeat request(HARQ)-acknowledgement (ACK) for the specific downlink multicast channelamong one or more PUCCH resources included in the specific PUCCHresource set is indicated through the DCI.
 14. A base station fortransmitting a signal in a wireless communication system, comprising: atransceiver; and a processor configured to perform operations, theoperations comprising: configuring at least one physical uplink controlchannel (PUCCH) resource set associated with at least one downlinkmulticast channel; generating downlink control information (DCI) havinga cyclic redundancy check (CRC) scrambled with a specific group-radionetwork temporary identifier (G-RNTI); and transmitting, through thetransceiver, a physical downlink control channel (PDCCH) carrying theDCI in a search space for scheduling of a specific downlink multicastchannel among the at least one downlink multicast channel, wherein aspecific PUCCH resource set associated with the specific downlinkmulticast channel is mapped to a specific downlink frequency band havingthe search space for the transmitting of the PDCCH, wherein a PUCCHresource for reception of hybrid automatic repeat request(HARQ)-acknowledgement (ACK) for the specific downlink multicast channelamong one or more PUCCH resources included in the specific PUCCHresource set is indicated through the DCI.